If I have my history right, reports on soft lead is that it mushrooms well but that it tends to "splatter" and skid rather than "break through". Dunno though as I have never tested in anything that could tell me if that is the case at these velocities. I know folks shot lead-tin through 357 magnum so that has to be similar velocities. Not much on terminal ballistics from those days. I do know a lot of people died to lead bullets in the cartridge era.
As for the expansion most pure lead come apart at that level of expansion, splitting. Hard lead castings shatter. Tin, it appears, at high alloying makes the bullet more plastic.
As for the expansion most pure lead come apart at that level of expansion, splitting. Hard lead castings shatter. Tin, it appears, at high alloying makes the bullet more plastic.

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